What is bob song- its not dark yet about?

Bob Dylan's song "Not Dark Yet" expresses themes of mortality, reflection, and the passage of time. It introspects on the realities of aging, the inevitability of death, and the need to make the most of life. The song's lyrics offer a contemplation of life's journey and the recognition that the end is approaching, but there's still time to find meaning, hope, and gratitude before the darkness sets in.